lesser celandine vs genus Ranunculus

lesser celandine and genus Ranunculus both are nouns.

Word	Noun	Adjective	Verb	Adverb
lesser celandine	Yes	No	No	No
genus Ranunculus	Yes	No	No	No

lesser celandine (noun)	genus Ranunculus (noun)
perennial herb native to Europe but naturalized elsewhere having heart-shaped leaves and yellow flowers resembling buttercups; its tuberous roots have been used as a poultice to relieve piles	annual, biennial or perennial herbs: buttercup; crowfoot